I know that this was talked a lot and recently Mark Callaghan
also gave a session in MySQL user conference 2008 about the real
bottlenecks.

Other day I was testing my thread pool stuff with MySQL 5.1.24 +
InnoDB plugin 1.0.1 along with other miscellaneous benchmark
tests by making them CPU bound by keep the working set completely
in memory to gauge the performance of threads overhead; and on
8-core box InnoDB seems to be doing better than 4-core. And then
immediately I started few tests with mysqlslap by …

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